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Simulation of the Dynamics of Non-Player Characters' Emotions

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Simulation of the Dynamics of Non-Player Characters' Emotions 1 Simulation of the Dynamics of Non-Player Characters’ Emotions and Social Relations in Games Magalie Ochs, Nicolas Sabouret, and Vincent Corruble Université Pierre et Marie Curie (Paris 6), LIP6 {magalie.ochs,nicolas.sabouret,vincent.corruble}@lip6.fr Abstract One of the main challenges faced by the video game industry is to give life to believable Non-Player Characters (NPCs). Research shows that emotions play a key role in determining the behavior of individuals. In order to improve the believability of NPCs’ behavior, we propose in this article a model of the dynamics of emotions taking into account the personality and the social relations of the character. First, we present work from the literature on emotions, personality and social relations in Computer Science and in Human and Social Sciences. We focus on the influence of personality on the triggering of emotions, and the influence of emotions on the dynamics of social relations. Based on this work, we propose a dynamic model of the socio-emotional state and its implementation as part of a tool for game programmers. This tool aims at the simulation of the evolution of emotions and social relations of NPCs based on their personality and roles. Index Terms Non-Player Character (NPC), emotions, social relations, personality. I. INTRODUCTION The success of a video game, as for other works of art, relies greatly on its ability to give a feeling of immersion to the player. This feeling is related to the notion of willing suspension of disbelief [6], i.e. to the player’s decision to live fully a story despite the lack of realism of some details. In order to create an environment, a world or a story which helps this process, the game designer needs to aim for credibility rather than realism. Credibility in a game is a rather complex notion which implies a degree of consistency between the various elements of the world (events, environments, characters, interactions,...) [37]. In many games, this consistency relies significantly on the behaviors of Non-Player Characters (or NPCs). Key elements of the narrative, their credibility is paramount to the player’s perception that he/she observes truly living beings. However, in modern video games, which may be viewed as interactive media, the player’s actions directly impact the progression of the narrative. The designer cannot therefore predict precisely the direction taken by the story as he cannot know beforehand where the player will take it. This is why the NPC’s credibility becomes difficult to ensure. A first approach is to consider the tree of possibilities, where each player’s choice (action, dialog, etc.) corresponds to the branching out towards two 2 or more directions. The NPC’s behavior in this case is somewhat modeled a priori, using for example scripting languages or finite/states automata. This approach, though very much used in industry up to now, quickly meets some serious limitations: either the density of the tree of possibilities is too low and the player quickly realizes that the universe he explores, which was meant to be open, is actually closed, which makes it disappointing; or this density is too high, which leads to programing issues, in terms of complexity, time, cost and also reliability1. Another approach consists in giving to the NPCs a degree of autonomy, considering them as intelligent agents making decisions and acting as a function of their own goals. This approach raises questions which are classical for Artificial Intelligence researchers related to the design of intelligent agents in complex environments. Here again the specific nature of video games is that the goal is not to reach some form of optimal behavior as measured by an agent/centered objective performance criterion, but really to produce behaviors which are credible from the player’s standpoint. Credibility, as suggested above, relies greatly on the notion of consistency. Let’s outline below two dimensions of consistency in NPCs’ behavior: • consistency with past behavior, with the idea that the behavior from an NPC has to be compatible with what we observed from them previously. This translates into the idea that the stable dimensions of a character need to be visible in the long term. Let us mention here two elements which we will tackle later in this article : (1) the personality, i.e. the set of psychological traits, suitably parametrized, which impacts the perceptions, motivations and actions of a character; (2) the individual experience, seen as the set of events the character lived previously and memorized. An NPC will therefore have to behave consistently with its past experience (the acquired knowledge, tastes or preferences that its past behavior has indicated, etc.) as well as with the personality traits which have been attributed to it. Any deviation from this principle would lead, for a majority of players, to a feeling of disbelief, and end the feeling of immersion, with a negative impact on the gaming experience. • consistency with the current environment, with the idea that NPCs must display a good reactivity to events happening in their environment, including the player’s actions (or the actions of the player’s avatar to be precise). As a simple example, a surprising action from the player (let’s say his/her avatar becomes violent with a yet friendly NPC) has to lead to a quick revision of the motivations of his/her interlocutor (in our example, the cooperative NPC will have to become unfriendly, uncooperative, etc.). This fine modeling of the motivational and decisional process can be done in a credible manner by taking into account the dynamics of the emotions and social relations of NPCs. Indeed, emotions are defined as cognitive and physiological mechanisms for the adaptation of behavior to the environment [36], which lets one react in various situations by influencing reasoning and decision making. Social relations between individuals represent attitudes one has toward another. They evolve as a result of interactions and have a direct impact on behavior. A credible simulation of these two dimensions, emotions and social relations of NPCs, therefore appears critical to the design of immersive games [30], [27]. To summarize the above line of reasoning, we went from the notion of immersion to the idea of NPC credibility, supported by two types of behavioral consistency (behavior internal consistency, and consistency with the environment). Based on [30], 1In many real life cases, the tree is actually both too dense for the developers and not enough for the players so both mentioned issues can be encountered simultaneously 3 [27], a key hypothesis in the work presented here is that both these types of consistency would be improved by a better emotional model taking into account the character’s personality and the dynamics of social relations. In this article, we present a model of personality, emotions and social relations aiming at the improvement of NPC credibility in video games. As we will see in II, these three notions have been the topics of intense research both in the field of Social and Human Sciences and in the field of Affective Computing [38]. Results found in the literature form a basis of useful pieces to build a more general model for an NPC architecture. It is therefore a first goal of this article to present and piece together results from various sources in a model that is unique and consistent, detailed in III. Moreover, the model we are interested in focuses on the interactions between its various elements, including especially the influence of personality on emotions and of emotions on social relations. In a second stage, a novel feature of our work is to propose an operational numerical model (whereas research from psychology usually stops at qualitative models) that is capable of computing and updating dynamically the emotional states and social relations of NPCs. The operationalized model is introduced in the first part of Section IV. A third concern which guides our work is the ambition to propose a model that can be integrated in production tools for programmers of video games. Game developers are usually not specialists of Artificial Intelligence or Cognitive Psychology. This guided us toward models which are relatively simple to use. This leads us to keep our representations parsimonious (as few variables as possible) and also to minimize the number of parameters to be set by the user. We introduce the implementation of our model in a tool that is simple to use in the second part of Section IV. Lastly, we discuss in Section V the perspectives opened by our work, especially concerning its application to the design of NPC behaviors with improved credibility. II. BACKGROUND In this section, we present models of emotions, personality, and social relations that have been proposed in the literature and we discuss their applications to model Non-Player Characters’ behavior. A. Emotions models Research shows that the expression of emotions is useful to create an illusion of life in virtual character and to increase their believability [2], [52]. The main challenges to create believable emotional virtual character are to identify in which circumstances which emotions should appear, how to display emotions, and which behavior results from these emotions. In the work presented here, we are more particularly interested in the triggering conditions of emotion (i.e. in which circumstances which emotions should appear). Our research is based on the Cognitive Appraisal Theory of Emotions [46], [43], [36]. According to this theory, emotions are triggered by the subjective appraisal of an event. The perception and the cognitive appraisal of the event determine the type and the intensity of the felt emotions [46]. The appraisal of an event depends on each individual and more particularly on his/her goals and beliefs.
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